Ink cartridge



FIG. 1 is a perspective view of an ink cartridge, as viewed from the front, top, and left side, embodying our design;

FIG. 2 is a perspective view thereof, as viewed from the front, bottom, and left side;

FIG. 3 is a front of thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines represent unclaimed subject matter, or unclaimed depth (in the case of dotted lines within solid outlines), and form no part of the claimed design. 

The ornamental design for an ink cartridge, as shown and described. 